[PATCH] gitk: make Ctrl "+" really increase the font size

Only Ctrl "=" was bound to increase the font size, probably because
English keyboards have the plus on the same key as the equal sign.
However, not the whole world is English, and at least with some
other keyboard layouts, Ctrl "+" did not work as documented.

Noticed by Stephan Hennig.

Signed-off-by: Johannes Schindelin <Johannes.Schindelin@gmx.de>
Signed-off-by: Paul Mackerras <paulus@samba.org>
diff --git a/gitk b/gitk
index b3cb8e8..5560e4d 100755
--- a/gitk
+++ b/gitk
@@ -996,6 +996,7 @@
     bind . <$M1B-r> dosearchback
     bind . <$M1B-s> dosearch
     bind . <$M1B-equal> {incrfont 1}
+    bind . <$M1B-plus> {incrfont 1}
     bind . <$M1B-KP_Add> {incrfont 1}
     bind . <$M1B-minus> {incrfont -1}
     bind . <$M1B-KP_Subtract> {incrfont -1}